While Apple did not reveal the change log in the new iPhone 2.0.1 firmware update, iPhoneBuzz has put up 2 iPhone 3G side by side with different firmware for comparison.According to Vincent, loading up iPhoneBuzz.com is much faster in the new 2.0.1 firmware, compare to the 2.0 firmware. SMS typing and the backup process are also improved and faster. Check out the full report here

If you have jailbreaked your iPhone 3G using the PwnageTool 2.0.1or PwnageTool 2.0, you might want to skip the new firmware update, unless you want to lose the jailbreak until the iPhone dev team release a new version. Here is a note on the iPhone Dev Team blog here

If your 3G iPhone is on a regular contract and you always plan to be with the carrier then you can update but you will lose the jailbreak and access to third party (non AppStore) applications.